Test flights may begin by the end of 2010, and testing would take at least a year, CEO Jeff Greason said.

CNN: Private space pioneers: We're inheritors of Apollo legacy

But making such a choice would be deeply flawed, believes Jeff Greason, the president of XCOR Aerospace and a leading proponent of commercial space.

BBC: SpaceX readies historic mission

If SpaceX managers are able to meet "even half of their mission goals, that would be a huge success, " according to Jeff Greason, chief executive of XCOR Aerospace, a space-transportation start-up.

WSJ: SpaceX's Pioneering Flight Plans

Jeff Greason, the president of XCOR Aerospace, a company that makes rocket engines for suborbital craft, worries that the X Prize, with its attached conditions, may not in practice lead to the right sort of craft being built.

ECONOMIST: Lift-off for enterprise | The